CN100508643C - Apparatus, system, and method for managing reverse link communication resources in a distributed communication system - Google Patents

Abstract

An apparatus, system, and method efficiently manage reverse link communication in a communication system having geographically distributed base stations. Coupled load information is exchanged between base stations allowing a base station to determine an appropriate allocation of reverse link channel resources to mobile stations served by the base station. Since the allocation of reverse link channels resources are controlled directly by the base station, delays due to communications with a central controller are eliminated. As a result, adverse effects of load scheduling based on obsolete reverse channel information are minimized.

Description

Be used for system and method and relevant device in distributed communication system managing reverse link communication resource

The cross reference of related application

The sequence number that the application requires to submit on June 16th, 2003 is 60/479,252, name is called the U.S. Provisional Application No. of " method and apparatus of the distribution control of reverse link communication load scheduling ", and the sequence number of submitting on June 19th, 2003 is 60/480,155, name is called the U.S. Provisional Application No. of " method and apparatus of the distribution control of reverse link communication load scheduling ", and these two applications are quoted as a reference in this integral body.

Technical field

The present invention relates generally to a kind of communication system, particularly relate to the equipment, the system and method that are used for supervisory communications reverse link (up link) communication.

Background technology

Many wireless communication systems utilize the provincialism distributed base station that communication cell or zone are provided, and the travelling carriage of serving BS in the zone of corresponding with service base station provides communication service in communication cell or zone.In some cases, be transmitted into the reverse link signal interference of base station other reverse link signal from each travelling carriage from other travelling carriage emission.Owing to disturb and limited resources, the capacity of each base station be restricted.The reverse chain-circuit capacity of base station is subjected to the reverse link effects of load of the travelling carriage of base station services, is subjected to the coupling reverse link effects of load of the travelling carriage of other base station services, and the influence that is subjected to other noise source.The reverse link load scheduling provides the effective use that makes system resource maximized mechanism by the transmission of control travelling carriage.In legacy communications system, centralized controller is estimated reverse link load and reverse link coupling load, and other factors, to determine suitable load scheduling.Yet use for most of data, although rl transmission can influence the load on other base station, travelling carriage is subjected to the control of single serving BS to reduce dispatch delay.

Yet legacy system is limited to several modes.For example, cause obvious delay with communicating by letter of centralized controller.The information that collect each base station is forwarded to centralized controller.Centralized controller is handled this information, is identified for the optimum load capacity of each base station, and sends the optimum load capacity to each base station.The communication of upgrading the travelling carriage that load capacity restriction serving that each base station provides according to controller.Yet channel condition often changes at emission, processing and the required time durations of reception optimum load capacity.Therefore, perhaps operate with a level that obviously is different from optimum level the base station, causes up resources or overload condition.For example work as because the delay in the system has not allowed new channel condition to be reflected in the information that passes to the base station, when perhaps making another base station overload of attempting near its heap(ed) capacity operation according to the base station of the last optimum capacity information operating that provides by controller, overload situations may take place.Overload situations causes obliterated data, the re-transmission of message, and other undesired consequences.

Therefore, there are the equipment of reverse channel resources in the effective allocate communications system of provincialism distributed base station, the needs of system and method at present.

Description of drawings

Fig. 1 is the communication system block diagram with provincialism distributed base station of exemplary embodiments of the present invention;

Fig. 2 is a single mobile station and block diagram as a part of communication system of the base station communication of serving BS and non-serving base stations;

Fig. 3 is the block diagram of the base station of exemplary embodiments according to the present invention;

Fig. 4 is the travelling carriage of diagram exemplary embodiments of the present invention and the block diagram of the typical relation between the base station;

Fig. 5 is the table of typical relation between diagram travelling carriage of exemplary embodiments of the present invention and the base station;

Fig. 6 is the reverse link that experiences on the base station load of exemplary embodiments of the present invention and the diagram of the exemplary distribution that the reverse link coupling is loaded;

Fig. 7 is the block diagram of a part of communication system of the present invention's first exemplary embodiments;

Fig. 8 is the flow chart that the present invention's first exemplary embodiments fixes on the method for the expected coupled load of carrying out on the serving BS really;

Fig. 9 is the flow chart that the present invention's first exemplary embodiments fixes on the method for the active volume on the non-serving base stations really;

Figure 10 is the flow chart of reverse chain channel resource in the supervisory communications of the present invention's first exemplary embodiments;

Figure 11 is the block diagram of a part of the communication system of the present invention's second exemplary embodiments;

Figure 12 is the flow chart of the method for the reverse chain channel carried out in the base station as serving BS of the management of the present invention's second exemplary embodiments;

Figure 13 is that the management of the present invention's second exemplary embodiments is at the flow chart as the reverse chain channel resource on the base station of non-serving base stations;

Figure 14 is the flow chart that distributes the method for reverse chain channel resource in the communication system with provincialism distributed base station of the present invention's second exemplary embodiments;

Figure 15 is the block diagram of the part of the usefulness provincialism distributed base station of the present invention's the 3rd exemplary embodiments communication system that communication service is provided to travelling carriage;

Figure 16 is the flow chart that the management of carrying out in the base station of the present invention's the 3rd exemplary embodiments has the method for reverse link resources in the communication system of provincialism distributed base station.

Embodiment

Reverse link communication in equipment of the present invention, the managing distributed base station communication of the system and method system.Here in the exemplary embodiments of Tao Luning, the base station distribution ground managing reverse link communication in the communication system.Because reverse link management does not rely on and the communicating by letter of central controller, and has therefore avoided the delay that is associated with the conventional art of managing reverse link channel.In first exemplary embodiments, non-serving base stations according on non-serving base stations, detect, owing to being another Base Station Identification that the coupling load parameter of the travelling carriage of serving BS is determined the coupling load indicator.The coupling load parameter provides the parameter of the indication of the coupling load that experiences on non-serving base stations, and can comprise such as normalization and the average received signal to noise ratio (SNR) and the parameter of mobile station speed.Coupling load indicator based on the coupling load parameter is forwarded to serving BS.Serving BS calculates the expected coupled load on the non-serving base stations according to coupling load indicator and travelling carriage transmission parameter (as the transmitted data rates of scheduling).This expected coupled load is forwarded to non-serving base stations, and wherein non-serving base stations calculates active volume by calculating expected coupled load.By the travelling carriage of non-serving base stations service according to the active volume of calculating by load scheduling.

In second exemplary embodiments, non-serving base stations calculates the maximum admissible coupling load owing to the travelling carriage of being dispatched by some other serving BS.Non-serving base stations is according to owing to being some other Base Station Identification each travelling carriage of serving BS, and the coupling load parameter on the non-serving base stations (such as normalization and average received signal to noise ratio (SNR)) is determined the coupling load indicator.In second exemplary embodiments, the maximum admissible coupling load related with non-serving base stations is forwarded to serving BS in each dispatching cycle, and with lower frequency the measurement of travelling carriage coupling load indicator is transmitted to serving BS.Because the serving BS in considering is the non-serving base stations of some other travelling carriage still, so serving BS is also determined from the load that is coupled by the maximum admissible of the travelling carriage of other base station services.Load scheduling is carried out according to being not by the maximum admissible coupling load of the travelling carriage of base station scheduling reservation in the base station, satisfies the constraint that applies from the maximum admissible coupling load of other base station reception simultaneously.

In the 3rd exemplary embodiments of the present invention, the serving BS basis is dispatched the travelling carriage rl transmission owing to the expected coupled load of the estimation of the rl transmission of the travelling carriage of other base station services.Each base station is estimated owing to the expected coupled load by the travelling carriage of other base station services.According to the coupling load of estimating and the capacity of base station, the base station load scheduling is by the travelling carriage of base station services.Therefore in the 3rd exemplary embodiments, the base station does not receive the clear and definite or direct coupling load from other base station.Therefore, do not support that in backhaul (backhaul) the 3rd exemplary embodiments is particularly useful in the communication of the coupling information on load between the base station.Although any one of some technology can be used for calculating the coupling load of estimation, this estimation in the 3rd exemplary embodiments is based on travelling carriage rl transmission formerly.The coupling load is never measured according to the SNR of actual transfer rate and measurement in each base station in the travelling carriage of base station scheduling.The measurement formerly of coupling load is fed to the statistical function of estimated expected coupled load during next scheduled transmission.Statistical function relies in some environment the correction that can be revised by self adaptation." blind " of the expected coupled load in some nargin determines that decision can be used for the active volume of base station, with the travelling carriage of scheduling by this base station services.

Fig. 1 is an exemplary embodiments of the present invention, and territory of use's property distributed base station 102,104,106,108 provides the block diagram of the communication system 100 of radio communication service to travelling carriage 110,112,114.Fig. 2 is the part 200 of communication system 100, wherein single mobile station 202 with communicate by letter as the serving BS 204 of travelling carriage 202 and the base station (102-108) of non-serving base stations 206.At certain special time, base station (102-108) can be used as the serving BS 204 or the non-serving base stations 206 of specific travelling carriage (110-114), perhaps can not carry out any function that is directly used in travelling carriage (110-114).For the sake of clarity, 102,104,106 and 108 and three travelling carriages 110,112,114 in 4 base stations in Fig. 1, have been represented.Communication system can comprise any amount of base station (102-108) and travelling carriage (110-114), and other communication equipment.In the exemplary embodiments that is presented, communication system 100 is cellular communication systems, and this cellular communication system utilizes code division multiple access (CDMA) communication technology that the voice-and-data business is provided.Those skilled in the art are by using the knowledge that conforms to known technology here, with the communication system of easily confirming to be suitable for for various other types of the present invention's use 100.

The travelling carriage (110,112,114) of each base station 102,104,106 and 108 in overlay area 116,118,120,122 or sub-district provides radio communication service.Overlay area 116-120 is overlapping, makes travelling carriage 110-114 at any time to communicate by letter with more than one base station 102-108.If travelling carriage 110-114 is positioned within the area of coverage of base station 102-108, then travelling carriage 110-114 is designated effective base station (active basestation) to base station 102-108.Yet as discussed in more detail below, has only a base station (102-108) as the serving BS 204 that is used for the specific travelling carriage 202 (110-114) of data communication.Serving BS 204 is the base stations of being responsible for the next one transmission of scheduling travelling carriage 202.Fig. 1 comprises the typical shape of each base station 102-108 periphery of representing coverage 116,118,120,122, and wherein 102-108 most probable in base station is as the serving BS 204 that is used for travelling carriage 202 (110-114) in the 116-122 of coverage.There is one group of effective base station in the memory in each travelling carriage 110-114, and wherein the member of this group is via the communication link communication of satisfying required standard.Selection is used for travelling carriage 110-114, the example of the appropriate method of effective base station (102-108) of 202 comprises, when when receiving signal from base station 102-108 emission with enough level on the travelling carriage 110-114, base station 102-108 is designated effective base station (102-108) 204,206.In exemplary embodiments,, select effective base station (102-108) 204,206 according to received signal intensity from base station 102-108,204,206 pilot transmitted signals.In some environment, other technology can be used for selecting effective base station (102-108) 204,206.Effectively base station (102-108) 204,206 provides communication service to travelling carriage 110-114,202, and wherein because a variety of causes, quality of service and data rate can be different between the 102-108 of base station.

In an exemplary embodiments, effectively one of base station (102-108) is selected as the serving BS 204 of the communication that is used for the data different with voice messaging.Any one of some kinds of technology and standard can be used to select serving BS 204.Can be according to forward communication link 210 (from base station 102-108 (204) to travelling carriage 110-114 (202)), reverse communication links 212 (from travelling carriage 110-114 (202) to base station 102-108 (204)) or oppositely and the feature selecting serving BS 204 of forward communication link 212 and 210.The quality of forward direction and reverse chain channel 210,212 for example can recently be determined by the carrier-in-interference of measured channel.In exemplary embodiments, the information that comprises in the reverse link channel quality indicator channel is used for identification service base station 204 and by the R-CQICH channel logo.Serving BS 204 is by carrying out various tasks, such as permitting the distribute data transmission rate via scheduling and the SNR that reverse-link pilot frequency receives being maintained on the threshold value, respond the communication of the travelling carriage 202 of serving from it by transmission power control commands.In addition, serving BS 204 decoding sends from the transmission of travelling carriage 202 and under the hybrid-ARQ situation to be confirmed, also can decode transmission and send ACK under soft handover case of non-serving base stations simultaneously.Close-shaped sex service zone, the type area 116-122 that defined of overlay area in the representative graph 1, travelling carriage 110-114 in the wherein regional 116-122 might suitably communicate by letter with corresponding base station 102-108, so that certain base station 102-108 is designated serving BS 204.Yet perhaps other base station (102-108) take on travelling carriage 110-114, effective base station (102-108) 206 of 202.Therefore as shown in Figure 1, first travelling carriage 110 is positioned within first coverage 116 that first base station 102 provides, second travelling carriage 112 is positioned within second coverage 118 that second base station 104 provides, the 3rd travelling carriage 114 is positioned within the 3rd coverage 129 that the 3rd base station 106 provides, and the 4th base station 108 provides the 4th coverage 122.

Fig. 3 is the block diagram of the base station 300 of exemplary embodiments of the present invention.Typical base station 300 is suitable for as the base station 102-108 in conjunction with Fig. 1 and Fig. 2 discussion, any one of 204,206.Base station 300 can comprise any combination of base station 102-108 being carried out hardware, software and the firmware of function.The function of square frame shown in Figure 3 and operation may be implemented within any amount of device, circuit or the software.Two or more functional blocks can be integrated in the single assembly, may be implemented within on several devices as the described function of carrying out in any one single assembly or functional block.For example, can carry out some by processor 304 and receive processing.

The base station comprises a radio set 302, and this radio set 302 is configured to communicate by letter with travelling carriage 110-114 according to the agreement of particular communications system 100.Radiofrequency signal is via antenna 308 exchanges, and in some cases, antenna 308 comprises sector (sector).Radio set 302 modulation, amplify and transmit, and reception and demodulation travelling carriage 110-114 are via the reverse link signal of reverse chain channel 210 emissions via forward link channel 212.

Processor 304 is any processor, microprocessor, computer, microcomputer or the processor combinations that are suitable for carrying out the control and the computing function of base station described here 300 and are suitable for promoting the whole functional of base station 300.The step of the method for the reverse link management functions of execution measurement of the software code of operation and processing signals and execution exemplary embodiments on the processor 304.

Backhaul interface 306 provides the interface to the backhaul 208 of communication system 100.Backhaul interface 306 comprises the hardware and software via backhaul 208 switching signals.Processor 304 via backhaul 306 to transmitting and receiving information with slave controller and other base station 102-108.

Fig. 4 is a block diagram, and Fig. 5 is the travelling carriage 110-114 of diagram exemplary embodiments of the present invention and the table 500 of the typical relation between the 102-108 of base station.The solid line that base station 102-108 is connected to travelling carriage 110-114 among Fig. 4 is represented being connected between travelling carriage 202 (one of 110-114) and their the corresponding serving BS 204 (one of 102-108), and dotted line is represented being connected between travelling carriage 202 (one of 110-114) and the effective base station 206 of their non-service (one of 102-108).Such as discussed here, the effective base station 206 of non-service (102-108) is the base station 300 that identifies in one group of effective base station (not being serving BS 204) of travelling carriage 202.In Fig. 4 and typical case shown in Figure 5, each travelling carriage 110-114 keeps one group of effective base station, comprises corresponding to the serving BS 204 of coverage 116-122 (it contains travelling carriage 110-114) and is all other base stations (102-108) of non-serving base stations (102-108).So for this typical case, all base station 102-108 of each among the travelling carriage 110-114 remain effective base station.Perhaps, the travelling carriage very far away at a distance of base station can not effectively kept this base station in the group of base stations, and this base station will not be identified as the non-serving base stations of this travelling carriage, even the return link interferences from this travelling carriage can be received in this base station.Have only the enough strong and processed travelling carriage of its transmission of those its signal strength signal intensities just can be considered by the base station.Main now consideration single mobile station 110, the first base stations 102 are that serving BS 204, the second base stations 104, the 3rd base station 106 and the 4th base station 108 of first travelling carriage 110,202 is non-serving base stations 206 of first travelling carriage 110,202.Therefore, although in this example, for any specific travelling carriage 110-114, have only a base station among the 102-108 of base station to operate as non-service (effectively) base station 206, still the rl transmission of each travelling carriage of receiving mobile 110-114 on each base station of base station 102-108 as serving BS 204 operations and other base station.As a result, the reverse link load of experience and reverse link coupling load is owing to the reverse link load of the travelling carriage 110 of base station 102 services and the coupling load that produced by the transmission of other travelling carriage 112,114 on base station 102.

Fig. 6 is an exemplary embodiments of the present invention, the diagram of the load pie chart 600 of the exemplary distribution of the reverse link that experiences on the 102-108 of base station load and reverse link coupling load.The various piece 602-608 representative of load pie chart is to the combination reverse link load of can then measuring of producing of a typical case travelling carriage 110-114 or emulation.At base station 102-108, total combination reverse link load can be produced by the transmission from travelling carriage 110-114, and each part (602-608) of wherein total reverse link load is the result of the travelling carriage (110-114) owing to particular category.Load part (602-608) can comprise non-service coupling load part 602, non-single service load part 604, single service 606 and the coupling load part 608 that does not count.Non-service coupling load part 602 comprises the coupling reverse link load owing to all travelling carriages (110-114), these travelling carriages are listed in base station (102-108) in their effective group of base stations, but these travelling carriages are being different from base station (102-108) service of this base station (102-108).Therefore contribute the travelling carriage 110-114 of non-service coupling load part 602 base station (102-108) not to be designated serving BS 204.

But non-single service load part 604 comprises the combination reverse link load of all the travelling carriage 110-114 in effective station list of listing them by base station (102-108) service other base station (102-108) in.Therefore, contribute the travelling carriage 110-114 of non-single service load part 604 base station (102-108) to be designated serving BS, but also other base station (102-108) is designated the effective base station of non-service.

Single service load part 606 comprises that wherein base station (102,108) are the unique base stations in any one effective group of base stations of travelling carriage 110-114 by the combination reverse link load of all travelling carriages of base station (102-108) service.

Do not count load part 608 comprise contributed total reverse link load be not included in other load part 602,604,606 all other reverse link signal and noises in any one.Can contribute the example in source that does not count load part 608 to comprise: from the base station not being listed in their effective group but fully near the rl transmission of base station with the travelling carriage of contributing total coupling load.These travelling carriages are too far away at a distance of the base station, so that with the suitable communication link of this base station this base station do not listed in effective group of base stations, must be enough to shared reverse chain-circuit capacity but the summation of their useless contribution is big.

Because channel condition often changes, the relative size of the part 602-608 that therefore loads in most of the cases changes in time.The change of channel condition may be because some factors, and such as the motion of travelling carriage 110-114, the moving of barrier perhaps needs to unload travelling carriage 110-114 and because the non-uniform Distribution seriously of travelling carriage 110-114 need shift travelling carriage between the base station.When the combination of all part 602-608 load exceeds the capacity of base station 102-108, the service quality (QoS) of travelling carriage to be suffered a loss (suffer), become slightly instability and sub-district of system covers to reduce and causes dropped calls.When load was lower than the capacity of base station 102-108, if can not adjust data rate according to the request of travelling carriage 110-114, the poor efficiency that resource then occurs was used.According to exemplary embodiments, reverse link communication is by base station 102-108 management, so that distribute reverse link resources (load scheduling) effectively to travelling carriage 110-114.Reverse link resources comprises the data rate and the power level of for example loading to base station 102-108 contribution.

Fig. 7 be the present invention's first exemplary embodiments provide the block diagram of a part 700 of the communication system 100 of communication service to travelling carriage 110-114 and provincialism distributed base station 102-108.In most of the cases, communication system 100 comprises and somely is positioned at crucial place so that the base station 704,706 of radio communication service to be provided to a plurality of travelling carriages 702.According to the quality of the communication channel between travelling carriage 702 and base station (704,706), travelling carriage 702 can be in any special time and more than one base station (704,706) communication.As mentioned above, each travelling carriage 702 keeps one group of effective base station, and wherein travelling carriage 702 enough is used to communicate by letter with communication link between effective base station 704,706.In effective base station, a base station is as serving BS 704, and other base station in effectively organizing is a non-serving base stations 706.This situation usually occurs in during the soft handover, and wherein single base station is carried out the function of serving BS 704, and one or more other base stations are the effective base stations 706 of non-service.When condition was guaranteed, the role transforming of serving BS 704 is (being that handover takes place) to a previous base station as the effective base station 706 of non-service.

For the sake of clarity, Fig. 7 comprises the piece of representing a travelling carriage 702 and two effective base stations 704,706, and wherein two effective base stations comprise serving BS 704 and non-serving base stations 706.Those skilled in the art will recognize that according to these knowledge and known technology, base station 300 can be used as the serving BS 704 of a large amount of travelling carriages 702, and any one travelling carriage 702 can keep any amount of effective base station 704,706.Therefore, knowledge discussed here can expand to any amount of travelling carriage 702, serving BS 704 and non-serving base stations 706.As following further go through, other base station 300 may not make its enough quality that become effective base station and communication link travelling carriage 702, but can contribute the load that experiences on any one base station of effective base station 704,706.Serving BS 704 can be first base station 102, second base station 104 or the 3rd base station 106 with reference to the above-mentioned discussion of Fig. 1-4.Serving BS 704 can also be as the non-serving base stations 706 that is used for another travelling carriage (Fig. 7 is not shown), and non-serving base stations 706 can be used as the serving BS 704 that is used for other travelling carriage (Fig. 7 is not shown).Therefore, base station 102-108 can be simultaneously as the serving BS 704 of some travelling carriage 702 and as the non-serving base stations of other travelling carriage.Therefore, in most of the cases, carry out each function in the base station 704,706 described here by other base station in the base station.

In first exemplary embodiments, as the base station 300 of non-serving base stations 706 according to the expected coupled load 712 that receives from another base station 300 as serving BS 704, determine the expection active volume, the expected coupled load on the expected coupled load 712 indication non-serving base stations 706 wherein, this expected coupled load is produced by the rl transmission 210 at the travelling carriage 702 of serviced base station 704 services just.Serving BS 704 use the coupling load indicator 710 received from non-serving base stations 706 with the related parameter of message transmission rate of next one scheduling, determine expected coupled load 712.Classify a plurality of travelling carriages 702 of non-serving base stations as if exist by serving BS 704 services and non-serving base stations 706, then expected coupled load 712 can be according to the transmitted data rates of expected coupled load 712 and scheduling for the definite expected coupled load of each travelling carriage with.Non-serving base stations 706 receives and handles the rl transmission 210 of travelling carriage 702, to determine one or more coupling load parameters, such as normalization and average received signal to noise ratio (SNR).The example of another coupling load parameter is the speed of travelling carriage 702.According to the coupling load parameter, non-serving base stations 706 calculates coupling load indicator 710.Coupling load indicator 710 is forwarded to serving BS 704.The transmission parameter of serving BS 704 use coupling load indicator 710 and travelling carriage 702 is determined the expected coupled load on the non-serving base stations 706.Expected coupled load is a coupling reverse link load, and this coupling reverse link load is what will obtain on non-serving base stations 706 owing to the further rl transmission of the expection of travelling carriage 702.Serving BS 704 is representing the value of expected coupled load 712 to be transmitted to non-serving base stations 706.The expection active volume that non-serving base stations 706 calculates on the non-serving base stations 706.Use the expection active volume, non-serving base stations 706 travelling carriage that it is being served by load scheduling is suitably managed the rl transmission by other travelling carriage (not shown) of non-serving base stations 706 services.When having an above travelling carriage 702, non-serving base stations 706 is measured and is also calculated the coupling load indicator 710 that non-serving base stations 706 is remained on each travelling carriage 702 in effective group.Coupling load indicator 710 is forwarded to each serving BS 704 related with travelling carriage 702 (it is designated effective base station to non-serving base stations 706).

In first exemplary embodiments, coupling load indicator 710 is that every chip energy is to noise interference (E _Cp/ N _t), wherein Ecp represents the energy of each pilot signal chip.If reverse-link pilot frequency is power-controlled, then pass through the chip (E of average specific period _Cp/ N _t) calculate average expectancy (E _Cp/ N _t).Coupling load indicator 710 can be average expectancy (E _Cp/ N _t) or average expectancy (E _Cp/ N _t) function.

Although can use other method that coupling load indicator 710 is transmitted to serving BS 704 in some cases, the load indicator that is coupled 710 sends via backhaul 208 in first exemplary embodiments.Therefore, suitably message transmission and addressing are used for seeking coupling load indicator 710 via backhaul 208, and backhaul interface 306 is carried out any required conversion, or via the processing of backhaul exchange coupling load indicator.In some cases, can send coupling load indicator 710 via the DCL between non-serving base stations 706 and the serving BS 704.For example, radio frequency or microwave Point-to-Point system link can be used for sending coupling load indicator 710 in some cases.In addition, in some cases, can transmit coupling load indicator 710 via travelling carriage 702.

In first exemplary embodiments, serving BS 704 is according to the coupling load indicator of receiving from non-serving base stations 706 710 (for example Ecp/Nt) and permitted the transmitted data rates that (scheduling) travelling carriage 702 uses between next transmission period, and sign is expected at launches during the next cycle and the travelling carriage 702 of generation expected coupled load 712.Therefore, in this first exemplary embodiments, transmission parameter comprises the desired data rate of travelling carriage 702 at least.In addition, other transmission parameter can be used for calculating the expected coupled load on the non-serving base stations 706, as second pilot transmission or control channel service pilot ratio.Under the situation that autonomous transmission takes place on control and the voice channel, expected coupled load 712 can be calculated the average expectancy coupling load by these channel contributions.In first exemplary embodiments, expected coupled load 712 is, will be by the expection E of non-serving base stations 706 experience in the next transmission of the expection of travelling carriage 702 _Cp/ N _tCertain function and comprise other transmission parameter of the transmitted data rates of scheduling.Serving BS 704 generates expected coupled load 712 based on coupling load indicator 710, and expected coupled load 712 is transmitted to non-serving base stations 706.Therefore in first exemplary embodiments, expected coupled load 712 is based on the E that has measured on the non-serving base stations 704 _Cp/ N _t, the reverse link transmit power on control and the voice channel, and the data rate on the Traffic Channel of travelling carriage 702.Yet expected coupled load 712 can be represented other value under some situation.For example, on behalf of the expection in the coupling of experiencing on the non-serving base stations load of comparing with transmission formerly, expected coupled load 712 can change.

When serving BS 704 is being served when at least one other non-serving base stations 706 listed in the above travelling carriage 702 of in effective group of base stations one, serving BS 704 generates the expected coupled load 712 that is used for each non-serving base stations 706, and wherein this non-serving base stations 706 is transmitted to serving BS 704 to coupling load indicator 710.So, can receive expected coupled load 712 from any amount of base station 300 as serving BS 704 as any certain base station 300 of non-serving base stations 706.

In first exemplary embodiments, expected coupled load 712 sends to non-serving base stations 704 via backhaul 208.Backhaul interface 306 is carried out via backhaul 208 and is sent expected coupled load 712 required processing and format to the base station 300 as non-serving base stations 704.In some cases, other technology can be used for transmitting expected coupled load 712.

After all suitable serving BSs 704 of the travelling carriage 702 of the non-service coupling load part 602 of contribution total load are received expected coupled load 712, non-serving base stations 706 (300) is determined active volume in base station 300.The summation of all expected coupled load is the non-service coupling of the expection of the total load on the base station 300 load parts.Active volume is the total capacity and the expection non-service coupling load part summation (402) of non-serving base stations 706 (300) and does not count the poor of load part 408.After the load of considering owing to voice or basic backward channel business, the active volume on the base station 300 (CAV) thereby can be expressed as:

C _AV＝C _TOT-(Load _Ex+Load _UA)

C wherein _TOTIt is the total capacity of considering owing to the load of voice and basic backward channel business; Load _ExBe the non-service of expection coupling load, it is to list travelling carriage in effective group of base stations in owing to other base station services with the base station; Load _UAIt is load owing to other source.

Utilize active volume, as the base station 300 of the non-serving base stations 706 that is used for travelling carriage 702, the travelling carriage (not shown) of serving to it distributes reverse link resources (load scheduling).In exemplary embodiments, non-serving base stations 706 is after the travelling carriage Resources allocation of keeping other effective base station, load scheduling in its effective base station without any these travelling carriages of other base station.

Fig. 8 is that the present invention's first exemplary embodiments fixes on the flow chart as the method for the expected coupled load of carrying out on the base station 300 of the serving BS 704 of at least one travelling carriage 702 really.In some cases, the method for Fig. 8 discussion is also carried out in as the base station 300 of non-serving base stations 706.Under at least one non-serving base stations 706 is maintained at situation in effective group of base stations of at least one travelling carriage 702, carry out the method for describing with reference to figure 8, this travelling carriage 702 is just by serving BS 704 services.Technology discussed here can be applied to any amount of base station 300 and travelling carriage 110-114.In exemplary embodiments, this method is carried out with the software code of operation on the processor 304 in one or more base stations 300 at least in part.Those skilled in the art will easily approve the various technology that can be used for realizing the method discussed based on the knowledge here according to known technology.

In step 802, receive coupling load indicator 710 from base station 300 as the non-serving base stations 706 of at least one travelling carriage 702.The indication of coupling load indicator 710 is measured on non-serving base stations 706, owing to the coupling load as the travelling carriage 702 of another base station 300 services of the serving BS 704 of travelling carriage 702.Non-serving base stations 706 is put within the effective group of base stations that is kept by travelling carriage 702.In first exemplary embodiments, the E that 710 representatives of coupling load indicator are measured on non-serving base stations 706 _CP/ N _T

In step 804, serving BS 704 is determined owing to the expected coupled load on the non-serving base stations 706 of travelling carriage 702 based on coupling load indicator 710 and at least one transmission parameter.In first exemplary embodiments, serving BS 704 according to the coupling load indicator of on non-serving base stations 706, measuring 710, be used to further contemplate that the schedule data transmission speed of travelling carriage of transmission and the transmission power level of travelling carriage 702, calculate the expected coupled load 712 that is expected at the travelling carriage 702 that next transmission sends.Therefore expected coupled load is the expection load of non-serving base stations, and it is that rl transmission owing to the travelling carriage 702 in effective station list of at least one serving BS 704 and non-serving base stations 706 being listed in travelling carriage causes that this expection is loaded.

In step 806, expected coupled load 712 is transmitted to base station 300 as the non-serving base stations 706 of travelling carriage 702.In first exemplary embodiments, expected coupled load 712 representatives are as the transmitted data rates and the expection E of scheduling on the non-serving base stations 706 _CP/ N _tThe expection of the function of level load, this is to further contemplate that what transmission caused owing to travelling carriage 702.Yet expected coupled load 712 can be represented other parameter or value.For example, expected coupled load 712 can be represented with transmission formerly and compare, and the expection of the load that experiences owing to the next one transmission of travelling carriage 702 on the non-serving base stations 706 changes.In first exemplary embodiments, expected coupled load designator 712 is formatted so that it meets suitable agreement, and sends via the backhaul 208 of communication system 100.Can utilize other technology that expected coupled load designator 712 is transmitted to non-serving base stations 706.For example, the direct link communication link between serving BS 704 and the non-serving base stations 706 (such as point-to-point microwave link) can be used for transmitting expected coupled load.

Fig. 9 is that the present invention's first exemplary embodiments is had the flow chart for the method for the active volume on the base station 300 of non-serving base stations 706 really made to order.In some cases, the method for discussing among Fig. 9 is carried out in also as the base station 300 of the serving BS 704 of other travelling carriage 110-114.Execution is with reference to the described method of Fig. 9, and wherein the effective group of base stations that keeps on a travelling carriage 702 at least comprises non-serving base stations 706 and serving BS 704.Technology discussed here is applicable to any amount of base station 300 and travelling carriage 110-114.

In step 902, receive expected coupled load 712 from base station 300 as the serving BS 704 of travelling carriage 702, described travelling carriage keeps one group to comprise effective base station of non-serving base stations 706 and serving BS 704 at least.As mentioned above, expected coupled load 712 is represented the next expected coupled load of transmitting of the expection owing to travelling carriage 702 that will experience probably on non-serving base stations 706.

In step 904, the active volume of determining on the non-serving base stations 706 according to expected coupled load 712 as the base station 300 of non-serving base stations 706.After considering voice and non-dispatching reverse business datum, non-serving base stations 706 is determined active volume by calculating the difference of total capacity and all loads and expected coupled load sum.The remainder indication can be used for the active volume of the non-serving base stations 706 of travelling carriage 110-114, and perhaps this travelling carriage 110-114 is used as serving BS to non-serving base stations 706.

In step 906, as the base station 300 of non-serving base stations 706 according to active volume, to distributing reverse chain channel 212 resources (load scheduling) by the travelling carriage 110-114 that is served as the base station 300 of the non-serving base stations 706 of travelling carriage 702.Non-serving base stations 706 distributes active volume by limiting power level and the data rate of any travelling carriage 110-114 that is being served by non-serving base stations 706.

In exemplary embodiments, carry out within certain areas's property distributed base station 300 in conjunction with Fig. 8 and the described method of Fig. 9, wherein any one base station 300 at any time can be only as serving BS 704, only as non-serving base stations 706, perhaps not only as the serving BS 704 that is used for one or more travelling carriage 110-114 but also as the non-serving base stations 706 that is used for one or more other travelling carriage 110-114.In addition, travelling carriage 702 can keep one group of effective base station, also comprises some non-serving base stations 706 except comprising serving BS 704.So in order effectively to manage the reverse link load on each base station 300, coupling load indicator 710 and expected coupled load 712 are sent to suitable base station 300, and the various parameters execution that consideration receives from a plurality of base stations 300 are calculated.

Figure 10 is the flow chart that distributes the method for reverse chain channel resource in the communication system 100 with provincialism distributed base station 300 of the present invention's first exemplary embodiments.As mentioned above, can in as the serving BS 704 of some travelling carriage 110-114 and single base station 300, carry out the function of serving BS 704 and non-serving base stations 706 as the effective base station 706 of non-service of other travelling carriage 114.

In step 1002, base station 300 as serving BS 704 is received in the coupling load indicator of measuring as on the base station 300 of non-serving base stations 706 710, wherein the coupling load is the rl transmission owing to the travelling carriage 702 that comes free serving BS 704 services, and this travelling carriage 702 keeps one group of effective base station that comprises one or more non-serving base stations 706.Each non-serving base stations 706 generates coupling load indicator 710, and this designator is represented the coupling that travelling carriage the brought load of having measured of being served owing to another base station 300 with transmission rate on non-serving base stations 706.Non-serving base stations 706 sends to respective service base station 704 to coupling load indicator 710 via backhaul 708.

The suitable representation of describing and relation being described between the different base station 300,704,706 comprises uses subscript to represent one group of base station.In first exemplary embodiments, except BSj ∈ ServingBS_MS _iOutward, (E is measured in each base station (BSj) during travelling carriage (MSi) is effectively organized _CP/ N _t) ji and send it to the serving BS of MSi.In first exemplary embodiments, (E _CP/ N _t) ji is used as the coupling load indicator.ServingBS_MSi is the serving BS group of travelling carriage (i), (E _CP/ N _t) ji (1+ (T/P) (Ri)+(C/P))/(1+ (E _CP/ N _t) ji (1+ (T/P) (Ri)+(C/P))) be the coupling load that non-serving base stations (BSj) is gone up the travelling carriage (MSi) of serving owing to serving BS of experience.(T/P) (Ri) be when transmission rate is Ri, the service pilot ratio of Traffic Channel.(C/P) be that control channel (and basic channel) power summation is to the pilot power ratio.In exemplary embodiments, representative (E _CP/ N _t) value of ji is sent to serving BS (BSk).

In step 1004, each serving BS 704 sign travelling carriage 702, this travelling carriage is launched by serving BS 704 services and during being expected at next transmission cycle.For each base station (BSk), BSk determines to comprise a group (FSk) of travelling carriage, and this travelling carriage is by the BSk service and have the priority that surpasses minimum priority.

In step 1006, each serving BS 704 is determined the expected coupled load 712 to non-serving base stations 706 of the travelling carriage 702 of serving owing to serving BS 704.Serving BS 704 determines to estimate the coupling load of each travelling carriage 702 (that is the member of group FSk) of transmission according to the coupling load indicator 710 that has received that receives on the serving BS 704 and the transmission parameter of travelling carriage 702.So BSk is identified for the expected coupled load of all MSi among the FSk among other BSj, wherein these $\mathrm{BSj}\∉\mathrm{ServingBS}\_M{S}_i$ ：

${\mathrm{CoupledLoal}}_{\mathrm{kj}}(R_i,{(E_{\mathrm{cp}}/N_t)}_{\mathrm{jt}})=\underset{j\∈\mathrm{ActiveSet}\left(i\right)}{\underset{i\∈{\mathrm{FS}}_K}{\mathrm{\Σ}}}\frac{{\mathrm{Sinr}}_{\mathrm{ji}}(R_i,(C/P))}{1+{\mathrm{Sinr}}_{\mathrm{ji}}(R_i,(C/P))}-\underset{j\∈\mathrm{ActiveSet}\left(i\right)}{\underset{i\∈{\mathrm{FS}}_k}{\mathrm{\Σ}}}\frac{{\mathrm{Sinr}}_{\mathrm{ji}}(0,(C/P))}{1+{\mathrm{Sinr}}_{\mathrm{ji}}(0,(C,P))}$

CoupledLoad wherein _KjBe BS _jLast experience owing to BS _kThe MS of service _iThe total coupling load that brings, Sinr _Ji(R _i, E[R _FCH]) be MS _iBe assigned with the speed R on the R-SCH _iThe time the estimated signal interference ratio, E[R _FCH]) be that control channel (comprising the basic speech channel and second pilot channel) power summation is to pilot channel power.Sinr _Ji(R _i, (C/P)) and (Ecp/Nt) _JiThe relation that following formula is arranged:

Sinr _ji(R _i，(C/P))＝(E _CP/N _t) _ji(1+(T/P)(R _i)+(C/P))

(T/P) (R wherein _i) be that transmission rate on the Traffic Channel of serving BS scheduling is R _iThe time the service pilot power ratio.

In step 1008, each serving BS 704 is transmitted to non-serving base stations 706 to expected coupled load (CoupledLoadkj).The expected coupled load that expected coupled load 712 representatives are calculated by serving BS 704.Each base station (BSk) is transmitted to all other base stations to CoupledLoadkj.In exemplary embodiments, send expected coupled load 712 via backhaul 208.

In step 1110, as the non-serving base stations 706 of at least one travelling carriage 702 and receive each base station 300 of expected coupled load 712, determine the active volume of non-serving base stations 706 according to expected coupled load 712.Because each non-serving base stations 706 can be the serving BS 704 that is used for other travelling carriage, if therefore special services base station 704 still is a non-serving base stations 706, then each serving BS 704 receives the coupling load indicator from other serving BS 704.So each non-serving base stations 706 use following formula of the BSk of reception CoupledLoadjk are determined the active volume on the BSk:

${\mathrm{CoupledinLoad}}_k=\underset{j\∉\mathrm{BS}\left(k\right)}{\underset{j,j\≠k}{\mathrm{\Σ}}}{\mathrm{CoupledLoad}}_{\mathrm{jk}}$

Cav _k＝Cav_base _k-CoupledinLoad _k

Wherein, CoupledinLoad _kIt is the coupling load sum that receives from other serving BS 704; Cav _kIt is the active volume of considering from the serving BS 704 after all other load contributions of voice and basic backchannel data business.

In step 1012, also, distribute the reverse chain channel resource to travelling carriage 110-114 (that is load scheduling travelling carriage) as the serving BS 704 of non-serving base stations 706 active volume according to serving BS 704.Therefore in first exemplary embodiments, the still mobile station MS i that serves by serving BS 704 of each serving BS 704 load scheduling of non-serving base stations 706, described mobile station MS i also keeps other effective base station according to following formula:

${\mathrm{CoupledoutLoad}}_k=\underset{j\∈\mathrm{BS}\left(k\right)}{\underset{j}{\mathrm{\Σ}}}{\mathrm{CoupledLoad}}_{\mathrm{kj}}$

Cav _k＝Cav _k-CoupledoutLoad _k

Wherein CoupledoutLoadk is the scheduling load of all travelling carriages that make a plurality of base stations in effectively organizing, but these travelling carriages are by the serving BS service.CoupledoutLoadkj is identical with the CoupledinLoadkj that BSK is transmitted to BSj.According to the residue active volume behind the scheduling travelling carriage, serving BS BSk is to the travelling carriage distribution reverse channel resources that only serving BS is remained unique effective base station.

Therefore, according to first exemplary embodiments of the present invention, each base station 300 is members of one group of effective base station of travelling carriage 702, and this base station 300 is measured and transmitted to the serving BS 704 of travelling carriage 702, owing to the coupling load of those travelling carriages 702 of other base station 704 services.Each serving BS 704 calculates by calculation base station 704 and keeps the expected coupled load 712 of those travelling carriages 702 that other effective base station serves.Active volume is calculated according to the expected coupled load that receives from other base station 300 as the serving BS 704 of other travelling carriage in each base station 704.So the expected coupled load that calculate according to other base station each base station 300 is determined active volume, the travelling carriage of contribution total load on base station 300 is being served in wherein said other base station.Like this, resource is effectively distributed and don't is used central controller, thereby makes the possibility that postpones minimum and reduced re-transmission and obliterated data.

Figure 11 is the block diagram of part 1100 of the communication system 100 of second embodiment of the invention.For the sake of clarity, Figure 11 comprises and represents two travelling carriages 1102 and two effective base stations 1104,1106, the i.e. square of serving BS 1104 and the effective base station 1106 of non-service.According to these knowledge and known technology, this area quantity technical staff will be appreciated that the base station can be used as the serving BS 1104 of a plurality of travelling carriages 1102, and any one travelling carriage 1102 can keep any amount of effective base station 1104,1106.Therefore knowledge discussed here can expand to any amount of travelling carriage 1102, serving BS 1104 and non-serving base stations 1106.Serving BS 1104 can be above-mentioned first base station 102, second base station 104 or the 3rd base station 106 in conjunction with Fig. 1-Fig. 4 discussion.Serving BS 1104 can also be as effective non-serving base stations 1106 of another travelling carriage (not shown among Figure 11), and non-serving base stations 1106 can be used as the serving BS of other travelling carriage (not shown among Figure 11).So the base station can be simultaneously as the serving BS 1104 of some travelling carriage and the effective base station 1106 of non-service of other travelling carriage 1102.Therefore, in most of the cases, other base station in the base station 1104,1106 is carried out each the function that is used for base station 1104,1106 discussed herein simultaneously.

In second exemplary embodiments, determine to load by the maximum admissible coupling of the travelling carriage 1102 of serving as another base station of serving BS 1104 as the base station 300 of non-serving base stations 1106.The load of other travelling carriage (not shown) of being served according to the total capacity of non-serving base stations 1106 with owing to non-serving base stations 1106, non-serving base stations 1106 are determined owing to can't help the maximum admissible coupling load of travelling carriage 1102 of non-serving base stations 1106 services.In second exemplary embodiments, non-serving base stations 1106 is for having the travelling carriage reserve capacity as certain other base station 1104 of serving BS.The travelling carriage 1102 that non-serving base stations 1106 definite base stations 1104 are served can be contributed the maximum admissible coupling load of total load on non-serving base stations 1106.Non-serving base stations 1106 is transmitted the summation of the maximum admissible coupling load 1112 that is used for all travelling carriages 1102 then, and described all travelling carriages 1102 remain in their effective group of base stations by serving BS 1104 services and non-serving base stations 1106.Non-serving base stations 1106 is identified for the coupling load indicator of each travelling carriage 1102.On behalf of the quality of service of measurement of the rl transmission of the travelling carriage 1102 on the non-serving base stations, coupling load indicator 1110 estimate.In the cdma system of power controlled pilot channel, on average long-term and expection pilot tone SNR is suitable coupling load indicator.Serving BS 1104 distributes reverse link resources according to maximum admissible coupling load to travelling carriage 1102.In second exemplary embodiments, serving BS 1104 distributes reverse link resources according to two groups of constraints.First group of constraint is that the capacity of serving BS 1104 applies, and require to distribute to the transmitted data rates of travelling carriage 1102 should be on producing on the serving BS 1104 less than serving BS 1104 load of active volume.Second group of constraint is that the maximum admissible coupling load 1112 that non-serving base stations 1104 is reported applies.The speed that serving BS 1104 is distributed to all travelling carriages 1102 (having non-serving base stations 1106 in their effective group) should produce the load of loading less than the maximum admissible coupling on non-serving base stations 1106.Coupling load indicator 1110 and the transmitted data rates decision that has distributed are loaded by the expection of travelling carriage 1102 contributions on non-serving base stations 1104.

Figure 12 is the present invention's second exemplary embodiments, the flow chart of the method for the managing reverse link channel of carrying out in as the base station 300 of serving BS.In some cases, the method for Figure 12 discussion is carried out in also as the base station 300 of non-serving base stations 1106.Execution wherein remains at least one non-serving base stations 1106 in effective group of base stations of at least one travelling carriage 1102 of being served by serving BS 1104 in conjunction with the described method of Figure 12.Knowledge discussed here can be applied to any amount of base station 300 and travelling carriage 1102.

In step 1202, as the base station 300 reception maximum admissible coupling loads 1112 of serving BS 1104, its representative is coupled as the maximum admissible on another base station 300 of the non-serving base stations 1106 of travelling carriage 1102 and loads.Maximum admissible coupling load 1112 is determined according to the priority and the service rate request of the travelling carriage of being served by non-serving base stations 1106 by non-serving base stations 1106.

In step 1204, on serving BS 1104, receive coupling load indicator 1110.In exemplary embodiments, coupling load indicator 1110 is based on the coupling load parameter of measuring on non-serving base stations 1106, and the quality owing to the Traffic Channel of the rl transmission 210 of the travelling carriage 1102 of serving BS 1104 services measured on non-serving base stations 1106 of representative.

On step 1206, serving BS 1104 is according to maximum admissible coupling load 1112, the rl transmission of management travelling carriage 1102.In exemplary embodiments, serving BS 1104 calculates the expected coupled load of all travelling carriages 1102, and these travelling carriages 1102 remain on non-serving base stations 1106 in effective group of base stations.Utilization is used for the coupling load indicator 1110 of each travelling carriage 1102 and the travelling carriage transmission parameter of each travelling carriage 1102, and serving BS 1104 calculates the expected coupled load that is used for travelling carriage 1102.Serving BS 1104 is dispatched to the message transmission rate of travelling carriage 1102, makes total expected coupled load on the non-serving base stations 1106 between next transmission period, will be no more than maximum admissible coupling load 1112.Therefore, serving BS 1104 is deferred to the restriction that is provided by non-serving base stations 1106 simultaneously to travelling carriage 1102 Resources allocation, minimizes the possibility of the overload condition on the non-serving base stations 1106 thus.

Figure 13 is the flow chart of the method for managing reverse link resource on as the base station 300 of non-serving base stations 1106 of the present invention's second exemplary embodiments.

In step 1302, base station 300 as the non-serving base stations 1106 of travelling carriage 1102, based on the coupling load parameter of on non-serving base stations 1106, measuring owing to travelling carriage 1102 rl transmission, to another base station 300, transmit coupling load indicator 1110 as the serving BS 1104 of travelling carriage 1102.

In step 1304, non-serving base stations 1106 is determined maximum admissible coupling load.The different mobile stations rate request is the sequence arrangement that successively decreases according to their priority.After the travelling carriage with higher priority was assigned with capacity, travelling carriage 1102 was assigned with a capacity, made some fraction of maximum admissible coupling load equal to leave for the capacity of travelling carriage 1102.

In step 1306, maximum admissible coupling load 1112 base stations 300 that are transmitted to as serving BS of representing the maximum admissible load.In second exemplary embodiments, maximum admissible coupling load 1112 sends to serving BS 1104 via backhaul 208.

Figure 14 is the flow chart that distributes the method for reverse chain channel resource in the communication system 100 with provincialism distributed base station of the present invention's second exemplary embodiments.As mentioned above, the function of serving BS 1104 and non-serving base stations 1106 can be carried out in single base station 300, and this single base station 300 is as the serving BS 1104 of some travelling carriage 110-114 with as the non-serving base stations 1106 of other travelling carriage 114.

In step 1402, be maintained at by all base stations in effective tabulation of the travelling carriage 1102 of another base station services coupling load indicator 1110 are transmitted to other base station 1104 of serving travelling carriage 1102.Coupling load indicator 1110 is based on the coupling load parameter of measuring on base station 1106.In second exemplary embodiments, the E owing to the rl transmission of travelling carriage 1102 is measured and transmitted in base station 1106 _Cp/ N _tValue, this travelling carriage 1102 remains in effective group of base stations by other base station 1104 services and base station 1106.

The suitable representation of describing and relation being described between the different base station 300,1104,1106 comprises uses subscript to represent one group of base station.In second exemplary embodiments, remove BSj ∈ ServingBS_MS _iOutward, each base station (BSj) during travelling carriage (MSi) is effectively organized is measured (Ecp/Nt) ji and is sent it to the serving BS of MSi.In second exemplary embodiments, (E _Cp/ N _t) ji be used as the coupling load indicator 1110.ServingBS_MSi is the serving BS group of travelling carriage (i), (E _Cp/ N _t) ji (1+ (T/P) (Ri)+(C/P))/(1+ (E _Cp/ N _t) ji (1+ (T/P) (Ri)+(C/P))) be the coupling load that non-serving base stations (BSj) is gone up experience owing to the travelling carriage (MSi) of serving BS service.(T/P) (Ri) be meant the service pilot ratio of the Traffic Channel when transmission rate is Ri.(C/P) be meant that control channel (and basic channel) power summation is to the pilot power ratio.In exemplary embodiments, representative (E _Cp/ N _t) value of ji is sent to serving BS (BSk).

In step 1404, from base station 1106, receive the coupling load indicator as the base station 300 of serving BS 1104, this base station 1106 is remained in effective group of base stations by the travelling carriage of base station 1104 services.

In step 1406, the request and the priority of the travelling carriage that the base station is served according to this base station are determined the maximum admissible coupling load 1112 owing to the travelling carriage of being served by other base station.Keep maximum admissible coupling load capacity 1112 (MaxTolerableCoupledLoadjk) as the serve as reasons travelling carriage of other base station services of the scheduler function among each base station j of non-serving base stations.

In step 1408, the base station is transmitted to other base station to maximum admissible coupling load.So, maximum admissible coupling load capacity 112 (MaxTolerableCoupledLoad jk) is transmitted to serving BS k as each base station of non-serving base stations.

In step 1410, receive maximum admissible coupling load 1102 as the base station of serving BS from non-serving base stations 1106, wherein non-serving base stations 1106 is maintained in effective group of base stations by the travelling carriage 1102 of this base station services.

In step 1412, many base stations are for by as the non-serving base stations 1106 of some travelling carriage with as a plurality of travelling carriages of the base station services of the serving BS 1104 of other travelling carriage, the active volume on the calculation base station.After all travelling carriage 1102 reserve capacities of other base station services of serving as reasons, calculate their active volume according to following formula as the base station of non-serving base stations j:

${\mathrm{Cav}}_j={\mathrm{Cav}}_j-f\×\underset{k}{\mathrm{\Σ}}{\mathrm{MaxTolerableCoupledLoad}}_{\mathrm{jk}}$

Cav wherein _jBe the active volume of being used on the non-serving base stations j dispatching travelling carriage, wherein for this travelling carriage, base station j is a serving BS.How conservative factor f represents base station j aspect the travelling carriage reserve capacity of its not responsible scheduling.F=0 represents base station j not for the travelling carriage that it is not dispatched keeps any capacity, and f=1 represents the extremely conservative situation of base station j.

In step 1414, the base station is by loading 1112 according to the maximum admissible coupling of receiving from other base stations, the managing reverse link transmission.In second exemplary embodiments, base station k distributes reverse link resources by distributing transmitted data rates according to following standard to all travelling carriage i of base station k service:

$\underset{;j\&Element;\mathrm{ActiveBS}\left(i\right)}{\underset{i:k\&Element;\mathrm{ServingBS}\left(i\right)}{\mathrm{\&Sigma;}}}{\mathrm{CoupledLoad}}_{\mathrm{jk}}(R_i,{(E_{\mathrm{cp}}/N_t)}_{\mathrm{ij}})<{\mathrm{MaxTolerableCoupledLoad}}_{\mathrm{jk}}$

$\frac{{\mathrm{Sinr}}_{\mathrm{kj}}(R_i,(C/P))}{1+{\mathrm{Sinr}}_{\mathrm{ki}}\left(R_i(C/P)\right)}\&le;{\mathrm{Cav}}_k$

Wherein, CoupledLoad and Sinr are with the definition of first exemplary embodiments.

So, the coupling load owing to the travelling carriage of other base station services on the base station is determined in each base station, be these travelling carriage reserve capacities, maximum admissible coupling load is transmitted to all serving BSs of those travelling carriages of service, and the maximum admissible that the non-serving base stations of the active volume of the travelling carriage of serving according to the base station and the travelling carriage of serving from the base station receives coupling load distributes reverse link resources.

Figure 15 is the block diagram of the part 1500 of the usefulness provincialism distributed base station 102-108 of the present invention's the 3rd exemplary embodiments communication system 100 that communication service is provided to travelling carriage 110-114.In most of the cases, communication system 100 comprises and locating so that the several base stations 1504,1506 of radio communication service to be provided to a plurality of travelling carriages 1502 strategicly.According to the quality of the communication channel between travelling carriage 1502 and the base station (1504,1506), travelling carriage 1502 can be in any special time and more than one base station (1504,1506) communication.As mentioned above, each travelling carriage 1502 keeps one group of effective base station, and wherein travelling carriage 1502 is communicated by letter with effectively the communication link between the base station 1504,1506 is suitable.In effective base station, a base station is as serving BS 1504 operations, and other base station in effectively organizing is a non-serving base stations 1506.Such situation usually occurs in during the soft handover, and wherein single base station is carried out the function of serving BS 1504, and one or more other base stations are the effective base stations 1506 of non-service.When condition guaranteed, the role transforming of serving BS 1504 was previous base station as the effective base station 1506 of non-service (that is, soft handover takes place).

For the sake of clarity, Figure 15 comprises the square of representing travelling carriage 1502 and two effective base stations 1504,1506 (comprising serving BS 1504 and non-serving base stations 1506).According to these knowledge and known technology, those skilled in the art will appreciate that base station 300 can be used as the serving BS 1504 of numerous travelling carriages 1502, and any one travelling carriage 1502 can keep any amount of effective base station 1504,1506.Therefore knowledge discussed here can be extended to any amount of travelling carriage 1502, serving BS 1504 and non-serving base stations 1506.Further go through as following, perhaps other base station 300 does not make its enough quality that become effective base station and communication link travelling carriage 1502, but can contribute the load that experiences on any one of effective base station 1504,1506.Serving BS 1504 can be first base station 102, second base station 104 or the 3rd base station 106 of discussing in conjunction with Fig. 1-Fig. 4.Serving BS 1504 can also be as being used for the non-serving base stations 1506 of another travelling carriage (Figure 15 is not shown), and non-serving base stations 1506 can be used as the serving BS 1504 that is used for other travelling carriage (Figure 15 is not shown).So, base station 102-108 can be simultaneously as the serving BS 1504 of some travelling carriage 1502 with as the non-serving base stations of other travelling carriage.Therefore, in most of the cases, each the function that is used for base station 1504,1506 described here is carried out simultaneously by other base station.

In the 3rd exemplary embodiments, estimate owing to expected coupled load 1508 as the base station 300 of non-serving base stations 1506, and distribute reverse link resources according to expected coupled load 1508 by the travelling carriage 1502 of other base station 1504 services.So, in the 3rd exemplary embodiments of the present invention, do not have direct or clear and definite communication to be sent out via the backhaul 208 between serving BS 1504 and the non-serving base stations 1506.Serving BS 1504 is dispatched all travelling carriages 1502 that it is being served according to the channel quality of the Traffic Channel that receives on serving BS 1504.

Non-serving base stations 1506 is estimating to can't help its scheduling (promptly, after the expected coupled load 1508 of all travelling carriages 1502 service) (but launching the reverse link signal 210 that is received and handled by non-serving base stations 1506) contribution, scheduling is by the travelling carriage (not shown) of non-serving base stations 1506 services.In some cases, the estimation of the expected coupled load 1508 of non-serving base stations 1506 is based in the soft handover with non-serving base stations 1506, the measurement of being made by the transmission formerly of travelling carriage 1502.Estimate to comprise the total expected coupled load from all travelling carriages 1502, wherein base station 1506 is non-serving base stations 1506 of travelling carriage 1502, and travelling carriage 1502 is by other base station services.

Figure 16 is carrying out in base station 300 of third embodiment of the invention, has the flow chart of the method for managing reverse link resource in the communication system 100 of provincialism distributed base station.

In step 1602, non-serving base stations 1506 is measured at least one the coupling load owing to the rl transmission 210 of the travelling carriage 1502 of being served by other base station 1504.In the 3rd exemplary embodiments, during each transmission intercal, non-serving base stations j measures by the control of all MSi contributions and the pilot tone SNR that has received (Ecp/Nt) ji on the voice channel) and transmission rate, described MSi has the BSj in effective group but not dispatched by BSj.Based on (Ecp/Nt) ji and transmission rate Ri, calculate total coupling load (TotCoupledLoadj) during the current transmission (by the n index) according to following formula:

${\mathrm{TotCoupledLoad}}_j\left[n\right]=\underset{j\&Element;\mathrm{ActiveSet}\left(i\right)}{\underset{t:j\&NotElement;\mathrm{Serving}\left(i\right)}{\mathrm{\&Sigma;}}}\frac{{\mathrm{Sinr}}_{\mathrm{ji}}(R_i,(C/P))}{1+{\mathrm{Sinr}}_{\mathrm{ji}}(R_i,(C/P))}$

Wherein, Sinr _Ji(R _i, (C/P))=(E _Cp/ N _t) _Ji(1+ (T/P) (R _i)+(C/P))

In step 1604, the expected coupled load of next transmission is estimated according at least one total coupling load of having measured that formerly transmits in base station 1506.Any one technology in some technology can be used to estimate be used for the expected coupled load (TotCoupledLoadj[n+1]) of next transmission, and particular technology depends on the type of communication system 100, the transmission structure and the other factors of reverse link 210,212.A suitable technique comprises the TotCoupledLoadj[n that has measured] as TotCoupledLoadj[n+1] desired value.Another technology comprises calculation of filtered mean value (Exp_TotCoupledLoadj), to be estimated as follows the TotCoupledLoadj[n+1 of formula appointment]:

$\mathrm{Exp}\_{\mathrm{TotCoupledLoad}}_j[n+1]=\underset{i=0}{\overset{L}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i{\mathrm{TotCoupledLoad}}_j[n-i]$

α wherein _iBe filter coefficient, L is the length of filtering.The signal processing scheme can be used for estimation coefficient α _iIn addition, factor alpha _iCan adaptively modifying,, make and estimate TotCoupledLoadj[n+1 so that at moment n+1] and the TotCoupledLoadj[n+1 that effectively measures] between the mean square deviation minimum.

Therefore, be determined owing to the total Payload that is used for that at least one formerly transmits by the rl transmission 210 of the travelling carriage of other base station services.The expection coupling of having estimated is based on formerly total coupling load, and can be set to equal formerly to be coupled one of load, perhaps can determine by a plurality of coupling loads of handling previous transmission cycle.Other technology can be used in some cases according to the definite expected coupled load of having estimated of the load that formerly is coupled.

In having rl transmission, in the system of hybrid ARQ, before grouping is successfully received, carry out transmission packets by a plurality of transmission.If the delay between first transmission and the respective transmissions remains unchanged, then transmission packets route and its follow-up re-transmission are referred to as the ARQ situation.Owing to retransmit, perhaps the strong correlation between the load of the coupling during the follow-up ARQ example exists.In order to utilize this relevant advantage, can from the transmission formerly during the identical ARQ example, estimate TotCoupledLoad.

In step 1606, the base station is according to the rl transmission of expected coupled load 1508 management of having estimated by the travelling carriage of base station services.In the 3rd exemplary embodiments, non-serving base stations j is at the expected coupled load Est_TotCoupledLoadj[n+1 that determines to have estimated] afterwards, upgrade the active volume of scheduling travelling carriage according to following formula, wherein this travelling carriage base station j as serving BS:

Cav _j＝Cav _j—Est_TotCoupledLoad _j

Base station j distributes reverse link resources, makes not exceed total active volume in the 3rd exemplary embodiments.So, in the 3rd embodiment, estimate owing to expected coupled load as the base station of non-serving base stations 1506 by all travelling carriages 1502 of other base station 1504 services, and, reverse link resource assignments is given all travelling carriages 1502 of serving by non-serving base stations 1506 according to the residue total capacity after considering total expected coupled load.

Obviously, those skilled in the art can easily make other embodiments of the invention and modification according to these knowledge.Above-mentioned explanation is exemplary and not restrictive.The present invention is only limited by following claim, all such embodiment and modification when considering in conjunction with above-mentioned explanation and accompanying drawing.Therefore scope of the present invention is not to determine with reference to above-mentioned explanation, but should determine with reference to claims and their gamut that is equal to.

Claims (51)

1, a kind of method of in base station, carrying out that is used for determining the expected coupled load on another base station of distributed base station communication system as the serving BS of travelling carriage, described method comprises:

Be received in from described another base station that described another base station is measured, owing to the coupling load indicator of the coupling load of the rl transmission that described another base station is remained on the travelling carriage effective group of base stations;

According to the travelling carriage transmission parameter of described coupling load indicator and described travelling carriage, determine expected coupled load to described another base station owing to described travelling carriage.

2, method according to claim 1 also comprises:

Described expected coupled load is transmitted to described another base station.

3, method according to claim 1, wherein said forwarding expected coupled load comprise via the backhaul that is connected between described base station and described another base station and transmit described expected coupled load.

4, method according to claim 1, wherein said travelling carriage transmission parameter comprises the transmitted data rates from the rl transmission of described travelling carriage.

5, method according to claim 4, wherein said travelling carriage transmission parameter comprises transmission power level.

6, method according to claim 1, every chip energy that wherein said coupling load indicator representative is measured on described another base station is to noise interference E _Cp/ N _t

7, method according to claim 1, every chip energy of the expection of wherein said expected coupled load representative on described another base station is to noise interference E _Cp/ N _t

8, the method for reverse link in a kind of supervisory communications from travelling carriage to the provincialism distributed base station, described method comprises:

In the coupling load indicator of a plurality of base stations reception from a plurality of other base stations, described coupling load indicator is based on the coupling load parameter of measuring on described other base station, and described coupling load parameter is owing to the rl transmission that is the travelling carriage of serving BS with described other Base Station Identification;

On each base station in described a plurality of base stations,, determine expected coupled load to described other base station owing to travelling carriage according to the travelling carriage transmission parameter of coupling load indicator and travelling carriage;

Described expected coupled load is transmitted to described other base station;

Determine the active volume of each base station in described other base station according to described expected coupled load; With

According to the reverse chain channel resource on each base station in described other base station of active volume distribution of described other base station.

9, method according to claim 8, determine that wherein active volume comprises:

On each base station in described other base station, the total capacity of calculating each base station in described other base station and difference owing to the sum of expected coupled load at least of the rl transmission of all travelling carriages that are serving BS with described other Base Station Identification, the respective service base station in the described serving BS of each mobile station identification.

10, method according to claim 9, wherein calculated difference comprises:

All load sums by other source and expected coupled load generation that calculating receives in each other base station are to produce total load;

Calculate total capacity on each other base station and the difference between the total load on each other base station, to produce active volume.

11, method according to claim 8 is wherein transmitted described expected coupled load and is comprised via the backhaul that is connected between described a plurality of base station and other base station and transmit described expected coupled load.

12, method according to claim 8, wherein said travelling carriage transmission parameter comprises the transmitted data rates from the rl transmission of described travelling carriage.

13, method according to claim 8, wherein said travelling carriage transmission parameter also comprises the travelling carriage transmission power level.

14, method according to claim 8, wherein said coupling load indicator represent every chip energy of measuring on the base station to noise interference E _Cp/ N _t

15, method according to claim 8, wherein said expected coupled load represent every chip energy of the expection on the base station to noise interference E _Cp/ N _t

16, a kind of base station comprises:

Control interface, be configured on another base station, measure, owing to the coupling load indicator of the coupling load parameter of the rl transmission that described another base station is remained on the travelling carriage in effective group of base stations; With

Processor is configured to the travelling carriage transmission parameter according to described coupling load indicator and travelling carriage, determines to estimate owing to travelling carriage the expected coupled load to described another base station of transmission.

17, base station according to claim 16, described control interface also are configured to described expected coupled load is transmitted to described another base station.

18, base station according to claim 16, wherein said control interface is further configured, and the backhaul via described base station being connected to described another base station transmits described expected coupled load.

19, base station according to claim 16, wherein said travelling carriage transmission parameter comprises the transmitted data rates from the rl transmission of described travelling carriage.

20, base station according to claim 19, wherein said travelling carriage transmission parameter also comprises transmission power level.

21, base station according to claim 16, every chip energy that wherein said coupling load indicator representative is measured on described another base station is to noise interference E _Cp/ N _t

22, base station according to claim 16, every chip energy of the expection on described another base station of wherein said expected coupled load representative is to noise interference E _Cp/ N _t

23, a kind of communication system comprises:

First group of provincialism distributed base station, be configured to from a plurality of second group of base station, receive, the coupling load indicator of the coupling load parameter of measuring on each base station in second group of base station, described coupling load is owing to the rl transmission that is the travelling carriage of serving BS with first group of Base Station Identification;

Each base station in first group of base station comprises processor, and described processor is configured to the travelling carriage transmission parameter according to described coupling load indicator and travelling carriage, determines the expected coupled load to second group of base station owing to the rl transmission of travelling carriage;

Each base station in first group of base station comprises control interface, and described control interface is configured to described expected coupled load is transmitted to second group of base station;

Each base station in second group of base station comprises processor, and described processor is configured to determine the active volume of second group of each base station in the base station according to described expected coupled load;

Each base station in second group of base station comprises radio set, and described radio set is configured to and other mobile communications, gives other travelling carriage with the active volume according to each base station in second group of base station with the reverse chain channel resource allocation.

24, communication system according to claim 23, wherein said transmission parameter comprises the transmitted data rates of travelling carriage.

25, communication system according to claim 23, wherein said transmission parameter comprises the transmission power level of travelling carriage.

26, communication system according to claim 23, wherein said processor also is configured to, and by the total capacity of calculation base station and the difference between the expected coupled load at least, determines active volume.

27, communication system according to claim 23, wherein said processor also is configured to calculated difference in the following manner:

By to owing to the load in other source and corresponding to a plurality of expected coupled load summations, calculate total load by a plurality of travelling carriages of a plurality of other base station services; With

Calculate the difference between total capacity and the total load, to produce active volume.

28, a kind of method of in base station, carrying out that is used for controlling distributed base station communication system reverse link communication as the serving BS of travelling carriage, described method comprises:

Receive maximum admissible coupling load, the representative of described maximum admissible coupling load is as the coupling of the maximum on another base station of the non-serving base stations of travelling carriage load, described maximum admissible coupling load be determined to be on described another base station owing to the peak load that is retained by the rl transmission of the travelling carriage of described base station services;

The coupling load indicator that receives that representative measures on described another base station owing to the coupling load parameter of travelling carriage; With

According to maximum admissible coupling load, the rl transmission of management travelling carriage.

29, method according to claim 28 also comprises:

Distribute reverse link resources according to described maximum admissible coupling load indicator between a plurality of travelling carriages, each travelling carriage in a plurality of travelling carriages remains in effective group of base stations by base station services and with described another base station.

30, method according to claim 29, wherein distribute reverse link resources to comprise:

Calculate the expected coupled load owing to each travelling carriage of a plurality of travelling carriages on described another base station, each expected coupled load is based on corresponding to the coupling load indicator of travelling carriage and the transmission parameter of travelling carriage; With

The rl transmission of control travelling carriage makes corresponding to the expected coupled load sum of described another base station less than the maximum admissible load indicator that is coupled.

31, method according to claim 30, wherein said travelling carriage transmission parameter comprises the transmitted data rates from the rl transmission of travelling carriage.

32, method according to claim 31, wherein said travelling carriage transmission parameter comprises the transmission power level of rl transmission.

33, method according to claim 32, every chip energy of measuring on described another base station of wherein said coupling load indicator representative is to noise interference E _Cp/ N _t

34, method according to claim 32, permissible every chip energy is to noise interference E on described another base station of wherein said maximum admissible coupling load representative _Cp/ N _t

35, a kind of method of on base station, carrying out of reverse link communication that is used for controlling the distributed base station communication system as the non-serving base stations of travelling carriage, described method comprises:

Transmit the coupling load indicator to another base station, described coupling load indicator represent measure on the base station owing to coupling load parameter by the rl transmission of the travelling carriage of another base station services, described travelling carriage remains on described base station in effective group of base stations; With

Transmit the maximum admissible coupling load of representing the maximum that has kept the coupling on the base station to load owing to travelling carriage.

36, method according to claim 35 also comprises:

Based on reverse link resources request, determine maximum admissible coupling load by other travelling carriages of base station services.

37, method according to claim 36, determine that wherein described maximum admissible coupling load also comprises:

Determine maximum admissible coupling load according to the transmission priority of other travelling carriage of base station services.

38, method according to claim 36, every chip energy that wherein said coupling load indicator representative is measured on the base station is to noise interference E _Cp/ N _t

39, method according to claim 36, wherein said maximum admissible coupling load represent on the base station permissible every chip energy to noise interference E _Cp/ N _t

40, a kind of base station comprises:

Control interface, be configured to measure from another described another base station of reception, base station, coupling load indicator owing to the coupling load parameter of the rl transmission that described another base station is remained on the travelling carriage in effective group of base stations, described control interface also is configured to receive maximum admissible coupling load, the representative of described maximum admissible coupling load is as the coupling of the maximum on described another base station of the non-serving base stations of travelling carriage load, described maximum admissible coupling load be confirmed as on described another base station owing to the peak load that has kept by the travelling carriage of base station services; With

Processor is configured to according to maximum admissible coupling sharing of load reverse link resources.

41, according to the described base station of claim 40, described processor is configured to, and by distributing reverse link resources according to described maximum admissible coupling load between a plurality of travelling carriages, distributes reverse link resources.

42, according to the described base station of claim 41, wherein said processor also is configured to distribute in the following manner reverse link resources:

Calculate the expected coupled load owing to each travelling carriage of a plurality of travelling carriages on described another base station, each expected coupled load is based on corresponding to the coupling load indicator of travelling carriage and the transmission parameter of travelling carriage; With

The rl transmission of control travelling carriage makes and loads less than the maximum admissible coupling corresponding to the expected coupled load sum of described another base station.

43, according to the described base station of claim 42, wherein said travelling carriage transmission parameter comprises the transmitted data rates from the rl transmission of travelling carriage.

44, base station according to claim 31, wherein said travelling carriage transmission parameter comprises transmission power level.

45, base station according to claim 32, every chip energy of measuring on described another base station of wherein said coupling load indicator representative is to noise interference E _Cp/ N _t

46, base station according to claim 32, permissible every chip energy is to noise interference E on described another base station of wherein said maximum admissible coupling load representative _Cp/ N _t

47, a kind of base station comprises:

Communication interface, be configured to the coupling load indicator is transmitted to another base station, that the representative of described coupling load indicator is measured on the base station, owing to the coupling load parameter of the rl transmission of the travelling carriage of described another base station services, described travelling carriage remains on described base station in effective group of base stations, and the maximum admissible that the kept load of rl transmission on the base station that is configured to be represented as travelling carriage is transmitted to described another base station; With

Processor is configured to the reverse link resources request according to other travelling carriage of base station services, determines maximum coupling load.

48, according to the described base station of claim 47, wherein said processor is configured to the transmission priority of other travelling carriage of serving according to the base station, determines maximum admissible coupling load.

49, according to the described base station of claim 48, wherein said processor is configured to the coupling load parameter of the rl transmission of the travelling carriage of serving according to described another base station, determines maximum admissible coupling load.

50, according to the described base station of claim 47, wherein said coupling load indicator represents every chip energy of measuring on the base station to noise interference E _Cp/ N _t

51, according to the described base station of claim 47, the every chip energy of permissible expection is to noise interference E on the described base station of wherein said maximum admissible coupling load representative _Cp/ N _t

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